3M™ Thinsulate UltraJust like regular Thinsulate™, it is lightweight, breathable and moisture-resistant. But Thinsulate™ Ultra insulation goes one step further. It is loftier and thicker than original Thinsulate™ insulation-for even greater warmth and comfort, yet still thin enough to allow complete freedom of movement. A mid-loft insulation, it is designed for some of the harshest conditions on earth and retains insulating value in damp conditions

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